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Date. January 21,2003 <br /> Quarter 41h Quarter,2002 <br /> 16 <br /> BP QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 11191 <br /> Address 1469 West Hammer Lane, Stockton, CA <br /> BP Environmental Engineer Scott Hooton <br /> Consulting Co/Contact Person URS/Vernon Elarth <br /> Consultant Project No 38466015 00436 <br /> Primary Agency/Regulatory ID No Sam Savik <br /> San Joaquin County Public Health Services <br /> WORK PERFORMED THIS QUARTER (Fourth 2002): <br /> 1 Groundwater samples were collected from monitoring wells MW-1 through MW-4 and were submitted for <br /> laboratory analyses <br /> 2 URS compiled and evaluated groundwater monitoring data <br /> WORK PROPOSED FOR NEXT QUARTER (First 2003): <br /> 1 Groundwater samples will be collected from monitoring wells MWA through MW-4 and submitted for <br /> laboratory analyses <br /> 2 URS will compile and evaluate groundwater monitoring data <br /> • 3 Install three additional groundwater monitoring wells <br /> QUARTERLY RESULTS SUMMARY (Fourth 2002): <br /> Current Phase of Project Monitoring _ <br /> Frequency of Groundwater Sampling MW-1 through MW-4 <br /> Frequency of Groundwater Monitoring Quarterly <br /> Sample Date 10/11/02 <br /> Is Free Product(FP) Present on Site No <br /> FP Recovered This Quarter NA <br /> Cumulative FP Recovered to Date NA <br /> Approximate Depth to Groundwater 52 75 to 53 12 feet below ground surface <br /> Direction of Groundwater Flow S-SW <br /> Groundwater Gradient 0 008 ft/ft <br /> ANALYTICAL DATA REVIEW: <br /> Based on the review of the analytical and hardcopy data (chain-of-custody records, blanks, dilutions, holding times, <br /> LCS/LCSD results,MS/MSD results, and surrogate recoveries),the data are acceptable as reported by the laboratory <br /> with the following limitations <br /> • Elevated reporting limits were due to dilutions performed by the laboratory in order to quantitate a target <br /> analyte, <br /> • In the total petroleum hydrocarbons as gasoline (TPHg) and benzene, toluene, ethylbenzene, total xylenes <br /> (BTEX) analyses of sample MW-4, the reporting limits were elevated due to high levels of non-target analytes, <br /> and <br /> K V5 BP ARCo511191\Q..mrly\4 QTR 02/11191 QMR4Q02 dM Page 1 <br />